DAVIDSON — SCOTTISH CAllBONIFBIWUS JiRACIIIOrODA. 
2G5 
For much of tlio information relative to tho localities in the last nine conntios 
I am indebted to Mr. (ioikio, Mr. l'a<^o, Mr. Tato, Pi-of. llainsay, Mr. Fraser, tho 
lato Dr. Fleming, and II. Miller; as well as to Sir R. Murchisoii and Mr. Salter, 
who have kindly allowed mo access to tho lists and specimens assondiled during 
tho (icologioal Survey of Scotland. I wish likewise to express my thanks to 
Prof's, do Koiunck and Phillips, Mr. Hancock, and to Dr. Gratiolot, of J^ai'is, ibr 
some of tho information I have been able to communicate ; and to Mr. Mackie 
for tho caro and trouble ho has bostovvod upon tho publication of this memoir. 
EXPLANATION OF THE PLATES. 
Plate XII. in Voi,. II. of the " Geologist." 
Fig. 1. Terehratula hastata. Sow. Nellfield, Lanarkshire. 
2. . From Ayrshire ; in the collection of Mr. Young. 
This specimen shows remains of colour marking. 
3 — 4. — sacculus, Martin. From West Lotluan and collection of 
Dr. Jleming. 
5. vesicularis, de Koninck. From West Lotliian and collection 
of Dr. Fleming. 
6. Athyris ainbUjua, Sow. HaUerhirst, Aja-shire. Collection of Mr. Ai-m- 
strong. 
7. . From Carluke, Lanarkshu-e. 
8. . Interior of the Ventral Valve. A, adductor or oc- 
clusor ; E, divaricator muscular impressions ; T, teeth ; D, dental, or 
rostral plates. 
9. — . Interior of the Dorsal Valve. A A, qnadrnple im- 
pressions of the occlusor muscle ; M, dental sockets ; N, hinge-plate ; 
O, point from which the spirals (here omitted) were developed. 8 
and 9 are from Capel Rig, East Kilbride, and collection of Mr. Arm- 
strong. 
10 — 11. plano-sulcafa, Phillips. From Lanarkshii-e. In fig. 10 a 
portion of the lameEiform exjjansions are represented. 
12. Royssii, L'EveiUe. From Coalburn, near Lesmahago. A portion 
only of the pectinated fringes are I'epresented. 
13. Retzia radialis, Phillips, var. From Brockley, near Lesmahago. Since 
tliis specimen was figured, several others have been found in the 
same locality, as well as at Gare. 
14. Spirifem duplicicosta, Phillips. Fx-om Balgrochan Glen, Campsie, Stir- 
lingshire. 
15. . From West Broadstone, Beith ; coUectiou of 
Mr. J. Thompson. 
16. trigonalis, Martin. Brockley, near Lesmahago ; collection of 
Dr. Slimon. 
17. . From Cousland Burn, near Dalkeith. 
18. . Campsie ; collection of Mr. Young. 
19. ■ hisulcata, Sow. Craigengien, Campsie ; collection of Mr. 
Young. 
20. . West Broadstone, Beith ; collection of Mr. J. 
Thomson. 
21. ■ . Ventral Valve, showing the imbricated surface ; 
fi'om Barrhead ; collection of Mr. A. Cowan. 
22. .. West Broadstone ; collection of Mr. Armstrong. 
23. . A coarse-ribbed variety ; in the Museum of Prac- 
tical Geology. 
VOL. III. 2 1, 
